State whether it is possible to determine whether one polymer is more likely to crystallize than the other. If it is possible, note which is the more likely and then cite reason(s) for your choice. If it is not possible to decide, state why. a) Linear and syndiotactic poly(vinyl chloride); linear and isotactic polystyrene b) Network phenol-formaldehyde; linear and heavily crosslinked cis-isoprene c) Linear polyethylene; lightly branched isotactic polypropylene d) Alternating poly(styrene-ethylene) copolymer; random poly(vinyl chloridetetrafluoroethylene) copolymer

State whether it is possible to determine whether one polymer is more likely to crystallize than the other. If it is possible, note which is the more likely and then cite reason(s) for your choice. If it is not possible to decide, state why. a) Linear and syndiotactic poly(vinyl chloride); linear and isotactic polystyrene b) Network phenol-formaldehyde; linear and heavily crosslinked cis-isoprene c) Linear polyethylene; lightly branched isotactic polypropylene d) Alternating poly(styrene-ethylene) copolymer; random poly(vinyl chloridetetrafluoroethylene) copolymer

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter31: Synthetic Polymers

Section31.SE: Something Extra

Problem 19MP

See similar textbooks

Similar questions

Outline the experimental method used to prepare Hydrogels/ Cryogels by Free Radical Polymerization technique in the lab.
The ε-caprolactone monomer from which the biopolymer polycaprolactone (PCL) is synthesized is depicted below. (a) What is the monomer's function? (b) What is the polymerization mechanism that results in the formation of PCL? (c) Define/Illustrate the homopolymer's repeating unit provided that the functional group is placed at the hydrocarbon chain's terminal position.
Poly(butylene terephthalate) is a hydrophobic plastic material widely used in automotive ignition systems. Suggest what monomers might be used to synthesize this polymer and how the polymerization might beaccomplished.
Explain with more details, how you can prepare poly(ethylene oxide) by using Anionic and Cationic polymerisation
1.- How does the molecular weight change vs % conversion in a step polymerization? Explain this behavior and why does it occur? 2.- Name at least 3 requirements for obtaining a high molecular weight polymer by step polymerization. 3.- How can you minimize cyclization reactions in a step polymerization? Explain with equations and narrative Why do you want to minimize cyclization? Is it possible to eliminate cyclic products completely?
) PLA, a polyester-based synthetic polymer, decomposes in our body fluid and separates into its constituent acids and alcohol. This acid in the body can cause inflammation. What would you recommend to overcome this disadvantage? b) The late decomposition of PLA, which is a biodegradable and hydrophobic polymer, in body fluid may create a disadvantage in applications where faster degradation is desired. What would you suggest to do to resolve this situation? Please explain.
Polyisobutylene is one of the components of butyl rubber used for making inner tubes. What conditions (cationic, anionic, free-radical) would be most appropriate for polymerization of isobutylene? Explain your answer.
A sample of polystyrene is composed of a series of fractions of different sized molecules. a)Calculate the number average and weight average molecular weights of this sample as well as the PDI. Comment on the PDI – is it polydispersed? b)How would adding styrene oligomer change the average molecular weights? Added amount is 5 wt. % of polymer mass and M = 1,000 g/mol. c)What would be the potential polymerisation pathways you may follow to polymerise this polymer d)What would happen if you fractionate the polymer to remove all fractions above 20,000 Da and 50% of any fraction above 15,000 Da? Recalculate the Mn, Mw, and PDI for this new system. e)What type of polymeric materials does this distribution of Mw for the new system corresponds to? Would it be likely solid or liquid at room temperature and atmospheric pressure?
2 Propose preparative routes to the following polymers or prepolymers from monomers. Give monomer structure and, if you think important, monomer ratios, catalysts, temperatures, etc.
Peter Parker is looking for new materials for his synthetic web. Materials generally involve polymers, which are long, repeating molecules, which can be linear or branched, which can have molecular masses in the order of thousands or tens of thousands of Daltons. To prepare polymers, advanced reactions are usually required, such as coupling reactions, Ziegler – Natta, advanced oxidations, among others. The characteristics of the polymer depend of the properties of the geometry and polarity of its precursors, so Parker decides to study different precursors proposed by Tony Stark. Help Parker with his investigation: a) Stark proposes to Parker that he can use some anions as crosslinking ligands between cationic polymers to increase the strength of your webs. He proposes you to try the anions of sodium dithionite (Na2S2O4), lithium borohydride (LiBH4), calcium hexafluorophosphate (Ca (PF6)2), ammonium fluorophosphate ((NH4)2PO3F) and sodium thiosulfate (Na2S2O3). Propose the most probable…
Which of the following monomers would you expect to polymerize readily by a free radical mechanism? Why 1,3 butadiene Propylene isobutylene
Polymers such as polypropylene contain a large number of chirality centers. Would you therefore expect samples of isotactic, syndiotactic, or atactic polypropylene to rotate plane-polarized light? Explain.